docs: Remove unused parameter docs.

Author: Sola-ris

src/tagstudio/previews/renderers/archive.py

@@ -151,7 +151,6 @@ def archive_thumb(
     Args:
         filepath (Path): The path to the archive.
         image_names: (list[Path] | list[str] | None): List of embedded image names to search for.
-        ext (str): The file extension. Used to help determine more specific archive type.
 
     Returns:
         Image: The first image found in the archive.